BRAKE SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
SERVICE BRAKE WEAR INDICATOR (EXISTING BRAKE DISC) CHECK - CONTINUED
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Values shown on screen are baseline values fo each service brake. The "Brk Meas Hourmeter"
value is reading on SMU. The SMU reading was recorded when new brake discs were installed on
DO NOT modify measurements or "Brk Meas Ho rmeter" values stored in powertrain ECM.
Change these values only when installing new brake discs.
Record each value of dimension (C) on piece of paper.
Exit MSD software.
Turn engine start switch to OFF position (TM 5-3805-
Disconnect MSD from diagnostic connector (WP
Determine amount of service life available for left
front service brake discs. Write down value of dimen-
sion (C) for left front service brake. Write down base-
line value for left front service brake stored in
Subtract value of dimension (C) from baseline value.
Difference indicates amount of wear that has occurred
to service brake discs.
DISC THICKNESS WEAR CHART
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A difference of 0.058 in. (1.46 mm)
or more indicates that discs must be
If you install a new brake disc in
any of the four service brakes, you
must enter a new baseline value.
Repeat steps 3 thru 22 for other service brake discs.
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The oil groove depth is the most critical
dimension. If the depth of the oil
grooves on the brake disc is too shallow,
oil flow will be inadequate. This can
cause excessive wear and abrasion.
To provide an estimate on the amount of service life
for a brake disc, refer to Disc Thickness Wear Chart.